Board Thread:General Discussion/@comment-26869340-20180415135522/@comment-32358261-20180416021253

For starters, mega charizard y should be timid. Don’t use physical moves like fly or flare blitz. I would replace fly with air slash or roost. Then flamethrower. Overheat should only be used as a last ditch effort or else it’s gonna be significantly weaker after. Max ev in speed and sp atk. 4ev sp def

For salamence Dragonium z or life orb (or mega but you got mega charizard y). Also jolly or adamant nature. For moveset go outrage, dragon claw, roost and fire fang. Max ev attack and speed, 4ev hp.

Gengar is actually ok. Give it the life orb. But I wouldn’t use sucker punch because attack is awful. Try focus blast or taunt.

Mawile is not worth using unless mega. Since mega charizard y has already filled that slot try a different mon. Perhaps a tanky pokemon. Metagross?

Lastly you need an electric Pokémon. Hidden power ice is almost always a must so that can be hard. On the top of my head I can think of rotom wash.